Hello, I’m really new to Panda3D and I’m having some issues while trying to replicate the Procedural Cube example from the demos in C++.
I am getting a “:thread(error): Deadlock! All threads blocked.” runtime error when I use “PT(Geom) square = new Geom(vdata);” and a “Assertion failed: _cache_ref_count > 0” when I use “Geom* square = new Geom(vdata);”. I’m fairly certain I am supposed to be using PT(Geom) on this, but not sure why it is having a Deadlock when creating the geometry. If I remove the PT(Geom) square and the add_primitive calls while returning null, it runs through without any errors or assertion failures.
I am running the following code: (the first is just in case I am initializing something wrong from the beginning).
PandaFramework pandaFramework;
pandaFramework.open_framework(argc, argv);
pandaFramework.set_window_title("Test for Procedural Cube");
PT(WindowFramework) windowFrameworkPtr = pandaFramework.open_window();
if(windowFrameworkPtr == NULL)
{
nout << "ERROR: could not open the WindowFramework." << endl;
return 1; // error
}
Polygon p;
GeomNode* snode = makeCube();Geom* makeSquare(int x1, int y1, int z1, int x2, int y2, int z2)
{
GeomVertexData* vdata = new GeomVertexData("square", GeomVertexFormat::get_v3n3cpt2(), Geom::UH_dynamic);
GeomVertexWriter* vertex = new GeomVertexWriter(vdata, "vertex");
GeomVertexWriter* normal = new GeomVertexWriter(vdata, "normal");
GeomVertexWriter* color = new GeomVertexWriter(vdata, "color");
GeomVertexWriter* texcoord = new GeomVertexWriter(vdata, "texcoord");
//make sure we draw the sqaure in the right plane
if( x1!=x2 )
{
vertex->add_data3f(x1, y1, z1);
vertex->add_data3f(x2, y1, z1);
vertex->add_data3f(x2, y2, z2);
vertex->add_data3f(x1, y2, z2);
normal->add_data3f(myNormalize(LVecBase3f(2*x1-1, 2*y1-1, 2*z1-1)));
normal->add_data3f(myNormalize(LVecBase3f(2*x2-1, 2*y1-1, 2*z1-1)));
normal->add_data3f(myNormalize(LVecBase3f(2*x2-1, 2*y2-1, 2*z2-1)));
normal->add_data3f(myNormalize(LVecBase3f(2*x1-1, 2*y2-1, 2*z2-1)));
}
else
{
vertex->add_data3f(x1, y1, z1);
vertex->add_data3f(x2, y2, z1);
vertex->add_data3f(x2, y2, z2);
vertex->add_data3f(x1, y1, z2);
normal->add_data3f(myNormalize(LVecBase3f(2*x1-1, 2*y1-1, 2*z1-1)));
normal->add_data3f(myNormalize(LVecBase3f(2*x2-1, 2*y2-1, 2*z1-1)));
normal->add_data3f(myNormalize(LVecBase3f(2*x2-1, 2*y2-1, 2*z2-1)));
normal->add_data3f(myNormalize(LVecBase3f(2*x1-1, 2*y1-1, 2*z2-1)));
}
//#adding different colors to the vertex for visibility
color->add_data4f(1.0,0.0,0.0,1.0);
color->add_data4f(0.0,1.0,0.0,1.0);
color->add_data4f(0.0,0.0,1.0,1.0);
color->add_data4f(1.0,0.0,1.0,1.0);
texcoord->add_data2f(0.0, 1.0);
texcoord->add_data2f(0.0, 0.0);
texcoord->add_data2f(1.0, 0.0);
texcoord->add_data2f(1.0, 1.0);
PT(GeomTriangles) tri1 = new GeomTriangles(Geom::UH_dynamic);
PT(GeomTriangles) tri2 = new GeomTriangles(Geom::UH_dynamic);
tri1->add_vertex(0);
tri1->add_vertex(1);
tri1->add_vertex(3);
tri2->add_consecutive_vertices(1,3);
tri1->close_primitive();
tri2->close_primitive();
PT(Geom) square = new Geom(vdata); //OR *... on one I get a refcount assertion, the other does deadlock threads
square->add_primitive(tri1);
square->add_primitive(tri2);
return square;
return NULL;
}GeomNode* makeCube()
{
Geom* square0 = this->makeSquare(-1,-1,-1, 1,-1, 1);
Geom* square1 = this->makeSquare(-1, 1,-1, 1, 1, 1);
Geom* square2 = this->makeSquare(-1, 1, 1, 1,-1, 1);
Geom* square3 = this->makeSquare(-1, 1,-1, 1,-1,-1);
Geom* square4 = this->makeSquare(-1,-1,-1,-1, 1, 1);
Geom* square5 = this->makeSquare( 1,-1,-1, 1, 1, 1);
GeomNode* snode = new GeomNode("square");
snode->add_geom(square0);
snode->add_geom(square1);
snode->add_geom(square2);
snode->add_geom(square3);
snode->add_geom(square4);
snode->add_geom(square5);
return snode;
}Any help or hints would be great!
-Thanks! 
